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The AFL FlexScan FS300 OTDR is a Quad OTDR capable of testing Single Mode, Multi-Mode, point-to-point and Passive Optical Networks (PON). Despite its relatively small size the FS300 OTDR offers high performance whilst being user friendly.

FlexScan® FS300 OTDR from AFL

Pocket-sized, performance-packed, user-friendly and fast OTDR

The FlexScan FS300 OTDR from AFL is a pocket-sized, performance-packed, user-friendly and fast OTDR.

With SmartAuto multi-pulse acquisition, 37dB dynamic range and best-in-class dead zones the AFL FlexScan FS300 OTDRs can test Single Mode and Multi-Mode fibre networks, including FTTH PONs and POLANs up to 1:64 split ratio while still detecting and measuring events at less than 2m apart. Its user-friendly display enables expert and novice technicians to quickly, reliably and accurately detect, locate, identify and measure optical network components and faults. The FS300 can use industry standard or user defined pass/fail criteria with the network being displayed on the intuitive, icon-based LinkMap view. Results can be printed to PDF or stored internally or externally. It automates test setup, shortens test times and simplifies results interpretation, improving test efficiency and cost.

Despite its pocket-sized appearance the FS300 delivers an all-day battery operation and has a large, bright 5” 800 x 480 touchscreen display that has large touch controls so no need for a stylus.

The AFL FlexScan FS300 has all-in-one test capability with optional connector inspection, integrated optical light source, power meter and VFL.

In SmartAuto mode the FlexScan F300 OTDR automatically analyses and tests the network using a variety of network-optimised settings to precisely locate, characterise and identify network events. Loss and reflectance are measured for connectors, splices, splitters and macro-bends. For even greater ease-of-use, FlexScan checks for live fibre and verifies OTDR launch quality before initiating a test.

LinkMap enables even novice technicians to easily and accurately troubleshoot optical networks. LinkMap presents an icon-based view of the tested network clearly identifying fibre start, end, connectors, splices, PON splitters, and macro-bends. A LinkMap Summary provides end-to-end link length, loss and ORL. Loss and reflectance of detected events is compared to industry standard or user-settable pass/fail thresholds and displayed with clear pass/fail indications. Users can instantly toggle between LinkMap and Trace views.

FlexScan FS300 Quad OTDRs are the ideal test tool for verifying and/or maintaining both Single Mode and Multi-Mode networks. Unlike most Quad OTDRs, FS300 Quad OTDRs test both point-to-point networks and FTTH PONs/Passive Optical LANs (POLANs).

Thanks to its WiFi and Bluetooth connectivity the FS300 OTDR can be paired with AFL’s FOCIS Flex for fast, easy connector end-face inspection. FOCIS Flex provides auto-focus, auto-centring, IEC pass/fail analysis, and Bluetooth transfer of images and pass/fail results to the FlexScan for display and/or archiving with OTDR results. Additionally, transfer FlexScan results wirelessly in the field to a mobile smart device for sharing via email or archiving in the cloud.


  • OTDR and Insertion Loss test & reporting
  • Fast, accurate point-to-point & PON verification & troubleshooting
  • Locate faults exceeding industry or user pass/fail thresholds
  • Visually pinpoint location of macro-bends or breaks

Features & Benefits

Features & Benefits

  • Test Single Mode and Multi-Mode, point-to-point and PON.
  • Detects closely spaced events without sacrificing range.
  • LinkMap icons clearly identify event type & pass/fail status.
  • Best-in-class 20 m PON dead zone.
  • Print-to-PDF plus internal & external data storage.
  • Integrated Source, Power Meter, Visual Fault Locator.
  • Bluetooth & WiFi communications.
  • Tether-free connector inspection with FOCIS Flex.
  • Rugged, lightweight, hand-held for field use.
  • 5” 800 x 480 color touchscreen LCD.



Emitter TypeLaser
Safety Class aClass I
Fibre TypeMultimode; compatible with OM1-OM5Single-mode; compatible with all G.65x
Wavelengths b850/1300 ±20 nm1310/1550 ±20 nm
Network TypePoint-to-pointPoint-to-point & PON up to 1:64
Connector TypeUser-specified APC or UPC ferrule with interchangeable UCI adapters
Dynamic Range c≥29/29 dB @ 850/1300 nm≥37/36 dB @ 1310/1550 nm
Event Dead Zone d≤0.8m @ 850/1300 nm typical≤0.8m @ 1310/1550 nm typical
Attenuation Dead Zone e≤3.0m≤3.5m
PON Dead Zone fNot applicable≤25m
Pulse Widths3, 5, 10, 20, 30, 50, 100, 200, 300, 500 ns; 1 μs3, 5, 10, 20, 30, 50, 100, 200, 300, 500 ns;

1, 2, 3, 5, 10, 20 μs

Range Settings250m to 30km250m to 240km
Data PointsUp to 300,000
Data Spacing≤5 cm to ≤16 m
Group Index of Refraction1.3000 to 1.7000
Distance Uncertainty±(1 + 0.0025% x distance + data point spacing) m
Linearity±0.03 dB/dB
Loss Resolution0.001 dB
Reflectance Range850: -20 to -58 dB; 1300: -20 to -63 dB1310/1550 nm: -20 to -65 dB
Reflectance Resolution0.01 dB
Reflectance Accuracy±2 dB
ORL Range20 to 60 dB
ORL Resolution0.01 dB
ORL Accuracy±2 dB over range 30 to 55 dB; ±4 dB over range 20-30 dB and 55-60 dB
Trace File Format.SOR, Telcordia SR-4731 Issue 2
OTDR Results StorageInternal or external USB memory
Internal StorageMinimum 4 GB internal non-volatile memory (App SW + > 5000 traces typical)
Internal Launch Fibre≥30m internal MM launch fibre≥50m internal SM launch fibre
OTDR ModesSupports SmartAuto, Expert, Real-Time for PON & point-to-point networks
Real-time Refresh Rate1 to 4 Hz
Live Fibre ProtectionNo OTDR damage when connected to live fibre delivering ≤ +18 dBm at wavelength(s) in range 825 to 1675 nm
Live Fibre DetectionReports live fibre with input signal ≥ -35 dBm for wavelength(s) in range 825 to 1675 nm


Notes: All specifications valid at 25 °C unless otherwise specified.
a FDA 21 CFR 1040.10 & 1040.11, IEC 60825-1: 2014.
b Measured with laser in CW mode at 23 °C ±3 °C.
c SNR=1, longest range and pulse width, 3 minute averaging.
d Maximum distance between two points 1.5 dB down each side of a reflective peak caused by an event with a -45 dB (or smaller) reflectance. Test pulse width is 3 or 5 ns.
e Maximum distance from the start of a trace spike caused by an event with a -45 dB (or smaller) reflectance, to the point where the trace returns to and stays within ±0.5 dB of backscatter. Test pulse width is 3 or 5 ns.
f Recovery to within 0.5 dB of backscatter after 1:16 splitter (≤13 dB loss) using 100 ns pulse width.


OPM – Optical Power Meter (P1 Option)
Calibrated Wavelengths850, 1300, 1310, 1490, 1550, 1625, 1650 nm
Detector TypeInGaAs PIN, 2 mm diameter
Measurement Range+3 to -70 dBm (+3 to-65 dBm @ 850 nm)
Tone Auto-Detect270 Hz, 330 Hz, 1 kHz, 2 kHz
Tone Detect Range+3 to -50 dBm @1300, 1310, 1550 nm;

+3 to -40 dBm @850 nm;

Wave IDAuto-synchronises & measures 1, 2 or 3 wavelengths
Wave ID Range+3 to -50 dBm @1300, 1310, 1550 nm;

+3 to -40 dBm @850 nm

Accuracy±5% @ -10 dBm
Linearity±0.1 dB (-3 to -40 dBm);

±0.25 dB (-40 to -50 dBm)

Resolution0.01 dB
Measurement UnitsPower in dBm, nW, μW, mW; Loss in dB


OLS – Optical Light Source (P1 Option)
Wavelengths850/1300/1310/1550 nm
Emitter TypeLaser
Safety Class 1Class I
Launch ConditionControlled Launch at 850 nm

(comparable to encircled flux on OM4 fibre)

Centre λ (CW Mode)±20 nm
Spectral Width5 nm maximum (FWHM, CW Mode)
Internal Modulation270 Hz, 330 Hz, 1 kHz, 2 kHz, CW, Wave ID
SM Output StabilityShort-term 2: ≤0.1 dB; Long-term 3: ±0.05 dB
MM Output StabilityShort-term 4: ≤ ±0.20 dB; Long-term 5: ±0.15 dB
Output Power1310/1550: -7 dBm ±1.5 dB (CW, G.652.C/D)

1300 nm: -7 dBm ±1.5 dB (CW, 50 μm MMF)

850 nm: 0 dBm ±1.5 dB (CW, 50 μm MMF)


VFL – Visual Fault Locator
Emitter TypeLaser, Class IIIa / Class 3R1
Wavelength635 nm ± 10 nm
Output Power1.5 mW (~+2 dBm ±0.5 dB) into SMF-28
ModesCW and 1 Hz flashing


Notes: All specifications valid at 25 °C unless otherwise specified.
1 FDA 21 CFR 1040.10 and 1040.11, and IEC 60825-1:2014
2 Typical maximum deviation over 15 minute after 15 minute warm-up.
3 Typical maximum deviation over 8 hours after 1 hour warm-up.
4 15 minutes after 15 minutes warm-up.
5 8 hours after 1 hour warm-up.


Size (in boot)98 x 175 x 52.5mm
Operating Temperature-10°C to +50°C, 0 to 95% RH (non-condensing)
Storage Temperature-30°C to +70°C, 0 to 95% RH (non-condensing, battery removed)

-20°C to +60°C, 0 to 95% RH (non-condensing, battery installed)

PowerRechargeable Lithium polymer battery; AC adapter
AC Adapter100-240 VAC, 50-60 Hz input; 5VDC, 2A output
Battery Life (OTDR)≥12 hours, Telcordia test conditions, 4 hours recharge
Display5-inch colour LCD, 800 x 480 pixels, backlit
Shock and VibrationGR-196-CORE, drop test, 0.75m (30″), 6 planes
Dust ProtectionGR-196-CORE, rubber dust caps for all ports
OTDR/OLS PortsMM: UPC; SM: UPC or APC; includes tool-free, interchangeable SC adapters
OPM and VFL PortsUniversal, 2.5mm adapter (SC, FC, ST); others available
USB PortsUSB host port; micro-USB function port
Bluetooth InterfaceW1 option; compatible with Windows PC and Android
WiFi InterfaceW1 option; compatible with IEEE 802.11 / WLAN
CE SafetyCompliant with EN61010-1
CE EMI/RFIEN55011, EN61326-1, GR-196-CORE 4.5.1
RoHSCompliant with RoHS directive 2011/65/EU


FlexScan Accessories

Part NumberDescription
FJK-1400-05-0230PZFlexScan wrist strap
FJK-1400-05-0231PZFlexScan neck strap, 36”
FJK-1400-01-0167PZSoft carry case for FlexScan, Fiber Ring, FOCIS Flex, OFI
FJK-4050-00-0033MRVehicle charger, 12 VDC to 5 VDC @ 2 A
FJK-4050-00-0931PRAC adapter 100-240 VAC to 5 VDC
FJK-3900-06-0001MRReplacement Li-Pol Battery Pack; 3.7 VDC, 6.8 AH
FJK-6000-00-0031MRCable, USB-micro B, 5 pin, 6 ft
FJK-6000-00-0034PR5V USB charging cable type A to barrel
FJK-4050-01-0001PRBundle of 5V USB charging cable and 10K mAh external USB battery pack
FJK-TRM-00-0920PRTRM® 2.0 upgrade from Basic to Advanced software

PDF Downloads

PDF Downloads